Electric motor.



No. 694,075. Patnted Feb. 25, |902. F. A. PucocK & c. w. KENNEDY. ELEcTmc moron.

(Application med July 2a, 1897.v

(no Model.) s'sheefs-sheet l.

ni: cams PETERS 60,. vnovoxmb.. wAsHmsfoN, u4 c.

zNo. 694,075. Patented Feb: 25

' F. A. PDCDGK & C. W. KENNEDY.

ELECTRIC MOTOR. (Application led J'Ly 29, 12897.)

3 Sheets-Sheet 2.

(,N'u Model.)

TH: Nonms Finns m.,PNo1o-L|THO., WASHINGTON. u, c

694,075. Patented Feb. 25, |902.v Y F. A. POCCK & C. W. KENNEDY.

ELEDTBIC IOTUR.

(Applicabxon lqd July 29, 1897.) un musi.) s sheets-sheet 3.

l ,6 lz

/ Homamg.

'me Nonms Pneus ou. mmap-mo.. wAsmNsToN, D. c.

- UNiTnD STATES 4PATENT OFFICE.

FRANCIS AGNEW POCOCK, OF PHILADELPHIA, AND CHARLES KENNEDY, OF RUTLEDGE, PENNSYLVANIA, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE ELECTRIC POWER DEVELOPMENT COMPANY, OF PHILADELPHIA,

PENNSYLVANIA.

nl laoTFuo MOTOR.

SPECIFICATION forming part of Letters Patent N o. 694,075, dated February 25, 1902.

v v Application filed July 29, 1897. Serial-No. 646,386. (No model.)

To all whom, t may concern,.-

Be it known that we, FRANCIS AGNEW Po- COOK,a resident of Philadelphia, in the county of Philadelphia, and CHARLES W. KENNEDY, a resident of Rutledge, in the county of Delaware, State of Pennsylvania, have invented certain new and useful Improvements in Electric Motors; and We do hereby declare that the following is a full, clear, and exact description of the invention, which Will enable others skilled` in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

Our invention relates to electric motors for cars, horseless carriages, and other vehicles; and its object is to provide an improvedconstruction of the same in which the held-magnets and the armature are rotatable in opposite directions, the driving-Wheels being entirely independent of each other and one connected with the 'field-magnets and the other connected through suitable gearing with the armature, so as to rotate in the same direction with the Wheel connected with the field and at the same speed. The construction is also such that as long as the current is passing through themachine the armature is always in motion, whether the vehicle be moving or is at rest, the slowing up, stopping, and starting being effected by mechanical means without in any way aiecting the current, but which may also be started and stopped, if

desired, by making and breaking the current,

as usual:

The invention consists in the novel construction and combination of parts hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is 'an elevation of an electric motor constructed in accordance with our invention. Fig. 2 is a longitudinal section of the same. Fig. 3 is a cross-section on the line xx, Fig. 1. Fig. 4. is a longitudinal section of a modified construction. Fig. 5 is a cross-section on the line a; Fig. 4.. Fig. 6 is a similar section on the line y y. Fig. 7 is a detail perspective view of the armature, showing the double windings thereon. Fig. S isa detail view of the strap-brake.

In'the said drawings, referring now to Figs. 1, 2, 3, and 7, the reference-numeral 1 designates the motor, 'and 2 the field magnets thereof, comprising the cylindrical ring 3, formed iu its interior with a number ot' polepieces 4, which are shunt-wound in any ordinary or convenient manner. This ringis providedwith end heads 5 and fgprovided with positive and negativeconducting-rin gs 6,With which the wire wound upon said pole-pieces is connected, by means of which the current is passed through said wire. One of these heads is provided with a bearing 7, which is securely iiXed to a tube S, which isrotatable on the axle 9 of the car, and secured to this tube is the wheel-hub l0. From this it will be seen that as the iield rotates the ring and heads will rotate therewith, which will consequently rotate the tube and wheel.

The numeral 12 designates the oppositelyrotatable armature, provided with a number of longitudinal peripheral grooves 13, forming ways for the windings of the armature. The armature is a double-wound one-that is to say, it has a commutator at each end, with which the wires in the alternate grooves are respectively connected. The current in both series of windings must of course Iiow in the `same direction. Said commutators are provided with positive and negative brushes 15, secured to the rotatable heads, which are connected with positive and negative conducting-rings 16, secured to the outside 'of said heads. The armature is secured to a tube 17, which is rotatable on the axle 9. The outer end of said tube is provided with a pinion 18, secured thereto. The end head l5a is provided with a bearing 7i, rotatable on the tube 17, and rotatably mounted on this bearing is a collar '19, provided with a disk 20, -to which are secured stud-shafts 2l. Four of these shafts are shown in the present instance, although more or less may be employed, if desired. Mounted on these shafts are rotatable pinions 23, which mesh with the pinion 18 and also with an interiorly-toothed flange 2i of a wheel or disk 25, secured to a tube 26, rotatable on the axle 9 and to which the hub l0 of the other driving-Wheel is secured.

The numeral 27 designates bearings, which support the tubes of the driving-Wheels and are intended to besecurcd to the car or other vehicle.

The numeral 28 designates a strap-brake consisting of a strip of spring metal, one end of which is connected With a rock-shaft 28 and the other end connected with the arm 2Sb of an elbow-lever 28C, the other arm 28d of which projects up above the car-platform, so that by depressing said arm 28d the said strap will be brought into frictional contactvvith the disk 20. The driving-wheels are also provided with brakes, as usual; but when the motor is used with a horseless carriage having pneumatic tires the brake should bear upon the exterior of the held-magnet ring and the wheel or disk 25.

In practice for cars and other heavy vehicles We intend to use two motors, one for the axle of each pair of driving-Wheels.

The motor is provided with a controller for regulating the speed and in the present instance is arranged to give four different speeds by the combination hereinafter described.

The operation is as follows: Supposiirr the car to be standing still, the controller is operated so as to run the motor at the maximum speed, and the brake being off the collar 19 the armature Will rotate at the full speed of the motor, as there is no resistance to it, the

pinions 23, carried by said collar, revolving around the pinion 18, and therefore not rotating the iiange-Wheel secured to the tube of the driving-Wheel. The field-magnets will also be stationary, owing to the resistance between the other driving-wheel and the rail or ground. If it is now desired to start the car, the brake is applied to the collar, and, acting as a resistance thereto, the movement of said collar is retarded, causing the pinions 23 to rotate the disk 25 and the driving-Wheel connected therewith, the speed at which the said disk is driven being governed by the pressure of the brake upon the collar and the consequent retardation to which the collar is subjected. At the same time the field-magnets Will revolve in the opposite direction to the armature, rotating the other drivingwheel at the same speed as the driving-Wheel connected with the gears, which latter Wheel by reason of the gears turns in the same direction as the other driving-Wheel. By this means the speed of the motor can be regulated irrespective of the controller and can be stopped by the brake without cutting off the current.

From the above it will be seen that the armature and field both rotating in starting the kinetic energy of the moving mass can be fully utilized, (for it is not necessary to stop the motor to bring the car at rest,) as by decreasing the resistance to gear collar any speed down to just moving can be obtained, which prevents the losses due to continual stopping and starting of the motor caused by crowded conditions and picking up and letting off passengers. As these cause the heaviest strains on the power-station, a reduction of them will materially lighten the maximum loads on the machineryand effect considerable saving.

The driving-wheels are entirely independent of each other, and so allow for different speeds of rotation in turning corners.

In Figs. t and G We have shown a modified construction of the gears between the armature and its driving-Wheel. In this case the pinions 23 do not mesh with the flanged gear- Wheel 25, but are provided with smaller pinions 23, which mesh with said gear 25, making a double reduction, if required. The other driving-Wheel in this case is also provided with intermediate gears arranged as follows: .Iournaled on the end head 5 is a collar 29, provided with a disk 30, having studshafts 3l. These stud-shafts are provided with pinions 32, Which mesh with a gear 34, secured to the end of said head. Said studshafts are also provided with smaller vpinions 35, which mesh with a gear 36 on the inner end of the tube which carries the driving- Wheel. These gears operate in a manner similar to those first above described.

Having thus fully described our invention, what We claim is- 1. In an electric motor, the combination with the armature and field-magnets adapted to rotate in opposite directions, of the central axle, the tube journalcd on one end thereof to which the hub of a wheel is secured, the tube journaled on the other end of said axle to Which the hub of another wheel is secured, the gear secured thereto, the tube journaled on said axle and secured to the armature, and gearing connected therewith engaging with said gear, substantially as described.

2. In an electric motor, the combination With the armature and field-magnets adapted to rotate in opposite directions, the central axle, the independent tubes journaled on the ends thereof, the Wheel-hubs secured to said tubes, and the internal gear secured to the inner end of one of said tubes, of the tube journaled on said axle intermediate the ends of the same, to which the armature is secured, the pinion and the collar secured thereto, the disk secured to said collar, the stud-shafts and the pinions meshing with said pinion and with said internal gear, substantially as described.

3. In an electric motor, the combination with the armature and field-magnets adapted to rotate in opposite directions, the central axle, the independent tubes journaled on the ends thereof, the wheel-hubs secured thereto and the internal gear secured to the inner ICO IIO

end of one of said tubes, of the tube journaled on said axle intermediate its ends and secured to the armature, the pinion at the outer end of said tube, the collar also secured to said tube, the disk secured to said collar, l

the stud-shafts, the pinions, and the strapbrake passing around said collar', and means for operating the same, substantially as .desoribed.

Intestimony that We claim the foregoing as 1o our own We have hereunto axed our signatures in presence of two Witnesses.

ERANCIS AGNEW POCOCK. CHARLES W. KENNEDY.

Witnesses:

GEO. W. CLEMENT, JAMES J. KANE. 

